646107577 has 4 divisors (see below), whose sum is σ = 658298340. Its totient is φ = 633916816.

The previous prime is 646107569. The next prime is 646107587. The reversal of 646107577 is 775701646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 775701646 = 2 ⋅387850823.

It can be written as a sum of positive squares in 2 ways, for example, as 586802176 + 59305401 = 24224^2 + 7701^2 .

It is a cyclic number.

It is not a de Polignac number, because 646107577 - 2³ = 646107569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646107557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6095302 + ... + 6095407.

It is an arithmetic number, because the mean of its divisors is an integer number (164574585).

Almost surely, 2^646107577 is an apocalyptic number.

It is an amenable number.

646107577 is a deficient number, since it is larger than the sum of its proper divisors (12190763).

646107577 is a wasteful number, since it uses less digits than its factorization.

646107577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12190762.

The product of its (nonzero) digits is 246960, while the sum is 43.

The square root of 646107577 is about 25418.6462464074. The cubic root of 646107577 is about 864.5065299898.

The spelling of 646107577 in words is "six hundred forty-six million, one hundred seven thousand, five hundred seventy-seven".